555定时器输出掉电延迟启动电路在电源领域的应用

Application of 555 Timer Output Power Off Delay Start Circuit in Power Supply Field

为保证系统的可靠性,需要实施上电时序控制,以确保各功能电路模块能够依次上电并正常工作。为避免上电时序紊乱,设计了一种基于555定时器的掉电延迟启动电路。该电路具有元器件使用量少、延迟时间可控、电源输出使能脚可控等优点,与直接控制功率输出相比,其更安全可靠、简单且成本较低。

To ensure the reliability of the system,it is necessary to perform power on timing control to ensure that each functional circuit module is powered on in sequence.In order to avoid causing power on timing disorder,a power off delay start circuit based on 555 timer output is designed.This circuit has the advantages of low usage of components,controllable delay time,and controllable power output enabling pins.Compared with direct control of power output,it is safety,reliability,simple,and low cost.